Managing energy consumption in buildings through offline and online control of HVAC systems

2016 ◽  
Author(s):  
Bo Chai ◽  
Wayes Tushar ◽  
Naveed Ul Hassan ◽  
Chau Yuen ◽  
Zaiyue Yang
Keyword(s):  
Energy Consumption ◽  
Online Control ◽  
Hvac Systems

scholarly journals A Statistical Approach for Selecting Buildings for Experimental Measurement of HVAC Needs

2017 ◽  
Vol 24 (1) ◽  
pp. 99-116
Author(s):  
Paweł Malinowski ◽  
Piotr Ziembicki
Keyword(s):  
Energy Consumption ◽  
Experimental Measurement ◽  
Numerical Experiments ◽  
Statistical Approach ◽  
Residential Buildings ◽  
Hvac Systems ◽  
Hot Water ◽  
Statistical Methodology ◽  
Domestic Hot Water ◽  
Water Demands

Abstract This article presents a statistical methodology for selecting representative buildings for experimentally evaluating the performance of HVAC systems, especially in terms of energy consumption. The proposed approach is based on the k-means method. The algorithm for this method is conceptually simple, allowing it to be easily implemented. The method can be applied to large quantities of data with unknown distributions. The method was tested using numerical experiments to determine the hourly, daily, and yearly heat values and the domestic hot water demands of residential buildings in Poland. Due to its simplicity, the proposed approach is very promising for use in engineering applications and is applicable to testing the performance of many HVAC systems.

scholarly journals A Short Review of Organic Nanofluids: Preparation, Surfactants, and Applications

2021 ◽  
Vol 8 ◽  
Author(s):  
Samarpan Deb Majumder ◽  
Ankit Das
Keyword(s):  
Heat Transfer ◽  
Energy Consumption ◽  
Total Energy ◽  
Thermophysical Properties ◽  
Short Review ◽  
Hvac Systems ◽  
Zero Energy ◽  
Total Energy Consumption ◽  
Preparation Methods ◽  
Enhancing Heat Transfer

Recently, there has been significant advancement in efforts toward achieving zero-energy buildings. It is quite evident that the HVAC systems consume a considerable percentage of the total energy consumption of a building; therefore, making them sustainable is of the utmost importance. Nanofluid serves as a simple, yet innovative, approach in decreasing the power consumption of the HVAC systems by improving the thermophysical properties of the coolants and enhancing heat transfer. As a result, this has attracted the attention of many researchers across the globe. This manuscript reviews the different preparation methods of nanofluid, surfactants used in stabilizing the nanofluid, and the different areas in which it can be used.

scholarly journals Energy Efficient Air Curtains for Industrial Gates in Cold Climates

2021 ◽  
Vol 246 ◽  
pp. 08005
Author(s):  
A.S. Strongin ◽  
A.M. Zhivov
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Efficient ◽  
Air Conditioning ◽  
Thermal Power ◽  
Hvac Systems ◽  
Energy Resources ◽  
Cold Climates ◽  
Construction Costs ◽  
Reduce Energy Consumption

In geographical areas with cold climates, large, massively constructed industrial and warehouse buildings and logistics complexes are large consumers of energy resources. The great height and large contained volumes of the premises, the presence of a significant number of doors, and building configurations that include many transport corridors all require the use of air-thermal curtains to increase the energy efficiency of the buildings’ heating, ventilating, and air-conditioning (HVAC) systems, which commonly produce several thousand kilowatts of thermal power. Optimization of air curtains can improve the microclimates of the premises, achieve savings in the initial construction costs, and also reduce energy consumption during operation by 10–20%.

scholarly journals Optimal Control Method for HVAC Systems in Offices with a Control Algorithm Based on Thermal Environment

Buildings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 95 ◽  
Author(s):  
Sung-Kyung Kim ◽  
Won-Hwa Hong ◽  
Jung-Ha Hwang ◽  
Myung-Sup Jung ◽  
Yong-Seo Park
Keyword(s):  
Optimal Control ◽  
Energy Consumption ◽  
Control Method ◽  
Thermal Environment ◽  
Hvac Systems ◽  
Control Algorithms ◽  
Total Energy Consumption ◽  
Indoor Thermal Environment ◽  
Optimal Control Method ◽  
Temperature And Humidity

This study examined a method to reduce energy consumption in office buildings. Correspondingly, an optimal control method was proposed for heating, ventilation, and air conditioning (HVAC) systems via two control algorithms that considered the indoor thermal environment. The control algorithms were developed by considering temperature and humidity as the factors of the indoor thermal environment that influence the control of HVAC systems and the predicted mean vote comfort ranges. Furthermore, an experiment was performed using office equipment that incorporated the two control algorithms for HVAC systems, and the correlation between changes in the thermal environment within the office and the occupant’s comfort levels was estimated via an actual survey. The results demonstrated that the proposed control method for HVAC systems, which considered the comfort ranges of temperature and humidity and the thermal adaptation capability, can efficiently maintain the occupant’s comfort with lower energy usage compared with conventional HVAC systems. Thus, the use of the control method contributes to the reduction of total energy consumption in buildings with HVAC systems.

IMPACT OF RETROFITTING ENERGY-EFFICIENT DESIGN STRATEGIES ON ENERGY USE OF EXISTING COMMERCIAL BUILDINGS: COMPARATIVE STUDY OF LOW-IMPACT AND DEEP RETROFIT STRATEGIES

2017 ◽  
Vol 12 (4) ◽  
pp. 70-88 ◽  
Author(s):  
Ajla Aksamija
Keyword(s):  
Energy Consumption ◽  
Energy Efficient ◽  
Hvac Systems ◽  
Building Envelope ◽  
Energy Modeling ◽  
Office Buildings ◽  
Existing Buildings ◽  
Design Strategies ◽  
Energy Usage ◽  
Building Systems

This article discusses energy-efficient retrofitting design strategies for commercial office buildings, and examines their effect on energy consumption. The objective of the research was to study how to integrate passive design strategies and energy-efficient building systems to improve building performance, and reduce the energy consumption of existing buildings in three different climate types (cold, mixed and hot climates). First, properties of existing buildings were analyzed based on national CBECS database to determine typical characteristics of office buildings located in Chicago, Baltimore and Phoenix, including size, building envelope treatment and building systems. Then, fourteen different prototypes were developed, varying the building shape and orientation to represent different building stock, and energy modeling was conducted to establish energy usage baseline. Multiple design considerations were investigated based on extensive energy simulations and modeling, where low-impact and deep retrofits were considered. Low-impact strategies included improvements to the building envelope, lighting systems and optimization of HVAC systems operation (without upgrading heating and cooling equipment). Deep energy retrofits also included improvements to building envelope and lighting, and considered changes and improvements to HVAC systems (specifically, integration of radiant systems). Energy modeling was conducted for all prototypes, and results were obtained for the baseline (current energy usage), and energy usage considering low-impact design strategies and deep retrofits. A total of 126 energy models was developed, simulated and analyzed, providing a dataset that captured energy usage for investigated scenarios. The comparative analysis of simulation results was used to determine how specific techniques lead to energy savings in different climate types, as well as for buildings of various shapes and orientations.

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